A coarse-grained fast-casting ball clay with medium plasticity and strength. SGP is an "industry standard" based on its popularity in for casting. It can also be used in plastic formed bodies. It is also widely used as a suspension aid in glazes.
Water of Plasticity: 33.8%
% Dry Shrinkage: 6.2
Dry M.O.R. (50:50 ball clay:silica, psi): 580
M.B.I. (meq/100g): 8.7
Specific Surface Area (sq-meter/g): 24.7
Soluble sulphur SO4: Low
Ball Clay Ball clays are abundant and very plastic and are used in all types of plastic forming bodies. They are not as white-burning or refractory as kaolins but lower in iron and fluxes than bentonites.